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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840612cc9d6c1ebb311c9937182da506a82d55a952ca4b66a200c2c09dc460c9' 
  AND token = 'BAtD/um16SAQwpYX1+LJP5OhL+VcweXQaMnIZQV0SYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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