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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fddf31b7993992bea484ec3994bf72823f0a9650804e8dd270c960bb0a739705' 
  AND token = 'OcN/hAfpJL+ovKHaw02s11IDKyXKMR+OJE9vcy9AV0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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