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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66388fb042688edfa199dd0009daa3a9e6e544a2de8f94fbb761db1ca028d5b6' 
  AND token = 'vT/64Y4U0BklK9jVYWIG8PxB16/CkeP5SzEOmR6ggSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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