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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad1ce2448b4b37cfea74e0b48b9748a1b69b3ffe874e7d4bf34726aae68ea6e' 
  AND token = '4N5/D+YIZqkKAnW/B4VXI0Cmv0V/frYKLUVWMN34FCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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