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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96dd5351bea2fa54e085facb8dd3bf3918d5113756d5084ab22dea8cd18deef9' 
  AND token = 'xDJDaZ8RAYSapzDjRurn2XWcbz/DF7+7g1pqpeYQuWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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