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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12a632cbc4c78fead0df8831a574c4e8b77bde79c3e452ff7cbfa1cbdf87fa0' 
  AND token = 'gArP0OQzryfyAWInwS9QqwmkaGanB7gceFjBbZo9Qj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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