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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02884d0d0cb1766ae6e49c76683c38cc6b4f749ee0c5b33de561cc85745977f9' 
  AND token = 'gnOVWfgtKbaDJECMogLaS8yG76IQlZ3s0DNFtoL182g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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