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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2f350b95d95ff098d39338b2352881d453b8ecbbebc9e4637c6a1e92c6bf9e' 
  AND token = 'dXfZZwb4NQRSWYymWpiVL69woCECoWiBiJ5Unm4K5LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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