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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5492e1201256c2a400f9570e5ece59efb186da48e43cff7d8ea75f048b7e3d' 
  AND token = 'ma9HTBHHDj9vv602pCFxqCsT7nFkLu3CobUh3GroWrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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