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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b693e853a2b845ca9edcb67d60b1770bca2959db04cfdeb082d36dae804ca7' 
  AND token = 'enlT8xG/I3oqq27rTIfzrjP3uRFjaOFHm6ayq3E1DpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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