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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f561f8c4c01ef668194bf1e16075fe453f23434827b755c9d3e783cc88c676e5' 
  AND token = '0sBBewqqxr2PmBFN10sDnQV9uW2ZoMOmn0c3xnSoc2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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