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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9890aa5318d5bd7d5335d397e0aeac27d790094d66a6b281ed6341a5eb868963' 
  AND token = 'tPdVmb/FO3S+d4AaZCc6cmWHaBBUzf263na2Tx7StTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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