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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd769352b26895ce54e15c96134ae69a17717e30b9d2282770d6537b3d22c708' 
  AND token = '+tGuqbNSBfxcq2Sgrg55VoEUlIUFWkCkWJPQVwlqlAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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