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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76b9036d1d1721631e962f7978fb45a1e43e5d1497248ee3ee03af6d36ea30d' 
  AND token = 'IU3yq1JmMLeim03ikiwNltcL13yTMflPsWLZpGSXQvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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