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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e457f04b7ef7a54348bfbe82af5e912246d7b9566d89c8e35af5d0bf0faff0' 
  AND token = 'vO2OjdkjeUkDYVB8wGw60BX2hfwg5uTHRLfMLoXTqKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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