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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e42bf081993112129af3a308a117587bdd38d4efe25a36ba1abf9adda91c92bb' 
  AND token = 'xeIgdgT/Pl8sdVPM2pVk9cL8JtO5ogYpxZn01ap3KaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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