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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0999564afbc9dfc2c7060649af2ed07b0b6a68010e5458e896780e9be9fdfc7' 
  AND token = '7u1GPyogUSQM0xD3L4Xbs5toJANkW/AjGAu+kZF1z8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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