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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02648dc93d0ca5219feb639ed8ff3b2dbc244090339637139e0e8832d8c6a50' 
  AND token = 'cDtS2ftLQPe3lAxchxRj2VBcpp0jzc/Ma3N6Y0Gg7u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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