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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085691679f80d5cab65ca4ee752f1ad9b8972029ecbcfb5cff17445c398f1436' 
  AND token = 'krsyGn254Plqrr6Av6u/cMOI3tbTMUn3iTx4a1SDVMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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