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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777e3c275981cb6ef75d523f5fc1d0533409a0608c58fa4a048ddfabf325574a' 
  AND token = 'H8u8ww7pWxC1dt5C2cbBSNvPefKn5TbgW0TDY0deUgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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