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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7e9c2a354c3c981ac7a64d1b84cf443a16a80b773a9c28a1bbc137d318c55f' 
  AND token = '1SMNGJ/TTCNEe5ruMDc1mZpQBRf/7SbaaJUTg4pdVu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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