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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82ab21cea9512aecb5a1d441383906790d49eb1adfa02c25b1239b1f29a69bf' 
  AND token = '4YzsBkaZYS1jy4AeT3E/TJhzVJ9RZv6pi1HjUjegtVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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