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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5ebb749670775e9d4bf805e40d4c44d9e7f58a174b8acdb7123be21317211d' 
  AND token = 'jczCqbkwYGqRb/W++P0D8GlcFzF2biJr4E179iO9/Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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