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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4afb08a253e0a2c5845bdd9be5c95028a9baa1486441f1f09f9285cb8760fa4' 
  AND token = 'tZI8WE+pWDmTvtmWAM15ieuVw25ayx7hvCJCHEKtgGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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