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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25585490d943cafd5b8c88fe58b10e806787639e0c610c4764546858eaea0c13' 
  AND token = '2C07BD+aYB5nM1rIVb92y4tJ3w/7zg3m6SqHDeBIbbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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