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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47848773ed74b35350f06023933b52981021900e1ebb353913ce2de76bf834e' 
  AND token = 'bodMYkDDnoEzcldnbgp1xM2VsReZ0eKGgLsUf203m1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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