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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28341077a7adba255f09d91aa13021a24cb477b085d4e619ac23030d66447bc3' 
  AND token = 'Ad67hGyt/8Zh8Mg2gzROTniJXEFGA/VpSL/ZC4cRcI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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