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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5572c4cb39b52c584d0b4900d2cce2112b23c4576f665c2b42f601d8d7e1c01' 
  AND token = 'lXNgTp8ww8ldakQlFbhHNrimz16+dsVYXYUf3LEtbWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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