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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8247570f9e3c93dc2dbacedf8f199deb365cd0d4591ed67b32c40bddf5a40036' 
  AND token = '3Oqr126OaP9MU+ed0MbpG9jRTk1zyKjwpW9B9C9M1z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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