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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8b37e45637962f7f2e53ff24472931bcd5b77744db423647c4945388ae8533' 
  AND token = 'gkN1FJcJG13e4QN+77ZIAoy77Oi5bDRs3PjUkr/hJlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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