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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666324adc9668a0b8302d78eb3d0e656e6d9e5ac1de3cb832ab6ca3d9bd80afd' 
  AND token = '7kFflcIP1qTf3kPSRmkm98oG/2oAMcKQovoBdz+L61s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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