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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b0ec22216f0717a38dbb79a0f0b6988a84043a9603e4c28079f66ef6ec0798' 
  AND token = '2yPh2ubcocK1o5ZT5Qf2VkdfxNsEaTCDA1/iafBU5wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}