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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5680d1c65f69577928f0503c4a973e593b1610534f25c2aa916dcd4a4132f9' 
  AND token = '798EeeFCwjus4/qDkRu95w4nZ2Kg/ao9fBHVsHl3L6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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