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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f92a3590c63da3a9d05c981a4bb94f4fe94a3c45f75d3992f3ad7c0e518aab' 
  AND token = '46oJGTrtsPcNTkopVSbiateUtEMiQ3g1V8qHeKbzWaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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