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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77884b0c1a3dce205c0e44512ea524e760709685bb7ce97c56e0304bee3528d1' 
  AND token = 'nPcVna/Qv1PYvm4JaTyFRwiXH/O2SsJ0T1nU+Xvv3UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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