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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7b211be0723d2760a318ffbbf7bbcf4f2d4ba74683b4320944d784132523c1' 
  AND token = 'VAt4DYLYtpFIXYC+Jk4glcm5Q09GtYTiNhsO3x5drVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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