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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9344812ddc67245179e7ea71651be6abb8fa300571e5333fe7624a2ff862e9c1' 
  AND token = 'XAtk39pYcdofRUJ0F8eCZgeHGCSyZaI1+cyzh6NucPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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