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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a69c55179b7603fbeff05a9f8481acb4acdd218a1df850bd1afd971a6a956f9' 
  AND token = 'rkAan6KPccVnAJnX5hs84QyMn2DMvA0Z4wXRROORObY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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