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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2369666c0ae32c82a3767e5f450800e6e142b87e4587a9af80602f0ad1f98ff1' 
  AND token = 'iv2LP2U0eVBA8PzNLAnAU40PfyhqWwCnJJsvf2o3MhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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