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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a352b16aacd8d4fe90cdb82b49c5521a371a88e7932a8ae91ea5f839df44037' 
  AND token = 's1z1/TU62z0JB9aYcJ0nxp0A4K+BIg6GBDRB5MREyGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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