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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4aafac9b0ac58d0749463ece2cf0e333ea27f5b0e9bfddbd280eab0d7235e8' 
  AND token = 'FAbzoYFq1oPhCtgESnliBSvar450U33oUCTiEgaf/hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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