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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661d010f2fff1f5073af741aa6aabb9d92d6674ff951ed0ba8ac92f4530471df' 
  AND token = 'tXbblXBJFN/z19fWkB9Cf6yJgUms/C5oYcKasAJJ1r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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