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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec35d2c653a7b26a4cbee0b3c2da20710fa0dcf79788b95788a25dd8a195bb3' 
  AND token = 'L56IBXx6ancXvjtyLwaah76hpywAJcqksw3oFJAutMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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