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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08df082d40985c069ff7cdc19b3f2aed324c1aecfe94fae7c5329181004c4d70' 
  AND token = 'woXZQhlFTzpk/f8Y4PgNPq3TxLz5q0HpbMJ4N9BOzAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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