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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c2ee662ea4ac3c25984209bc9b24e3989328d7f422a75a27f252ac837976fd' 
  AND token = 'QvPDr645qupvD30JTcItPMkB9V1F0lATz3hSOUkJ9u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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