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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea51e5ccf71387b06640f89b1296b1db12cba651b05b2f59257fb9d629281c19' 
  AND token = 'GbHzD3yXQ13M0iYk3tQK7glAm6OSVfxzWxVnHkHg4Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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