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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a39964aeb6e7cd6c643051bc7b5a108aeaedab02ccb5a7c68f43e5061685b02' 
  AND token = 'PvxCOZVF0th6TIKimGXIXIDa5dGgXRXUfG5vKEzZHLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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