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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e50c8b000ff1497d34af16b8f9a1c0421fedd014be4e33628c6202d3c35791' 
  AND token = '6ArajytQfIVqk8uMqd+v1z9TAFw7Vo26MtbgRX/uElA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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