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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5548824360e49094e2d4b7652a18b0e6e0a22bef9b5fbf4d204958e4b2d3faa' 
  AND token = 'O2INTCXkvc133Q0bfPFPMIT8U7Oov7uH8lI/AA0P1xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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