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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7cc3f09cad07c732a55f183ff8df8857f5970dc6ee837d0190a32291515781a' 
  AND token = 'EPOnRLNPyNgaMj60B7DFZG4GIjKAyyaq5tYBj0t6I7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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