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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe27d9cba1fb6a8cb360a7668a3d11805b0eb03b580a1b67325445bd27fc1c8f' 
  AND token = 'ax8f80iJOdSUGA+IDOygKLipNZ++n5QPvGQwpEYFSek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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