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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ef8b7386148a635a0b05387364525710a23ef0bdf44fc6cf9c33a5c9bd211e' 
  AND token = 'cVjM/ts0u78MoEnlg8rtXSmGBJRZTOVXUkyCnln1fyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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